In the absense of having any time/thing to write about in the last months, here's another quick tip.
iTerm 2 is a replacement application for the default terminal on OSX. It's highly popular due to allowing advanced features such as tabs, split panes, simpler theming and custom keyboard bindings.
If you find the need to enter the same commands into multiple panes at the same time, simply hit "⌘Command + ⇧Shift + I". You will recieve a small notification about sending input to all panes, the next text you type will physically begin typing into all open panes for your current tab and is executed once you hit "⏎ Return".
I find this extremley useful when I have 4+ panes open in a working state, I don't want to close them but I need to reload my bash profile because of some new changes, so I simply hit "Cmd + Shift + I", type "source ~/.bash_profile", hit "Return" and I'm done.